Lebanese Civil War: The first troops of a multinational force lands in Beirut to oversee the Palestine Liberation Organization's withdrawal from Lebanon.

The Lebanese Civil War was a multifaceted armed conflict that took place from 1975 to 1990. It resulted in an estimated 150,000 fatalities and led to the exodus of almost one million people from Lebanon.

The Multinational Force in Lebanon (MNF) was an international peacekeeping force created in August 1982 following a 1981 U.S.-brokered ceasefire between the Palestine Liberation Organization (PLO) and Israel to end their involvement in the conflict between Lebanon's pro-government and pro-Syrian factions. The ceasefire held until June 3, 1982, when the Abu Nidal Organization attempted to assassinate Shlomo Argov, Israel's ambassador to London. Israel blamed the PLO and three days later invaded Lebanon. West Beirut was besieged for seven weeks before the PLO acceded to a new agreement for their withdrawal. The agreement provided for the deployment of a Multinational Force to assist the Lebanese Armed Forces in evacuating the PLO, Syrian forces and other foreign combatants involved in Lebanon's civil war.

Beirut is the capital and largest city of Lebanon. As of 2014, Greater Beirut has a population of 2.5 million, just under half of Lebanon's population, which makes it the fourth-largest city in the Levant region and the sixteenth-largest in the Arab world. The city is situated on a peninsula at the midpoint of Lebanon's Mediterranean coast. Beirut has been inhabited for more than 5,000 years, making it one of the oldest cities in the world.

The Palestine Liberation Organization is a Palestinian nationalist coalition that is internationally recognized as the official representative of the Palestinian people in both the occupied Palestinian territories and the diaspora. It is currently represented by the Palestinian Authority based in the West Bank city of Al-Bireh.